About Doppler
Keep on track with your fitness. Encourages you to keep your desired pace by speeding up or slowing down your music as you do. Can be used for any sport speed is important: jogging, cycling or even rowing if you're careful!
Available in languages:
•Arabic •Italian
•Chinese •Korean
•Czech •Japanese
•English •Polish
•French •Portugese
•German •Russian
•Spanish
by G####:
Neat idea